body {
    background: url(../img/20140628113318690.jpg) no-repeat;
    background-size: 100%;
    background-position: 50%, 50%;
}

@mixin name($top) {
    width: 20px;
    height: 20px;
    position: absolute;
    top: $top;
}

.page {
    width: 1200px;
    margin: 60px auto;
    display: flex;
    position: relative;
    div {
        margin: 0 auto;
        width: 600px;
        height: 540px;
    }
    .input {
        background-position: 50%, 50%;
        div {
            width: 400px;
            margin: 0 auto;
            position: relative;
            form {
                margin: 0 auto;
                input {
                    margin-top: 80px;
                    width: 375px;
                    outline: none;
                    border: 0;
                    border-bottom: 1px solid #999;
                    padding-left: 25px;
                    background: none;
                    &::-webkit-input-placeholder {
                        font-size: 14px;
                        color: #d3d3d3;
                    }
                }
                img {
                    @include name(75px)
                }
                .i2 {
                    @include name(170px)
                }
                .i3 {
                    @include name(270px)
                }
                .i4 {
                    @include name(365px)
                }
                .ch {
                    width: 20px;
                    margin-top: 30px;
                }
                span {
                    font-size: 14px;
                    color: #999;
                }
                .btn {
                    margin-top: 20px;
                    width: 150px;
                    height: 40px;
                    border: 0;
                    background-color: #2191EF;
                    border-radius: 30px;
                    font-size: 18px;
                    color: #fff;
                    text-align: center;
                    padding-left: 0;
                    margin-left: 20px;
                    margin-right: 40px;
                }
                a {
                    display: inline-block;
                    width: 150px;
                    height: 40px;
                    border-radius: 30px;
                    text-align: center;
                    line-height: 40px;
                    color: #fff;
                    font-size: 17px;
                    background-color: #2191EF;
                }
            }
        }
    }
}